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Official Description

Excision or curettage of bone cyst or benign tumor of proximal humerus; with allograft

© Copyright 2025 American Medical Association. All rights reserved.

Common Language Description

The CPT® Code 23156 refers to the procedure of excision or curettage of a bone cyst or benign tumor located in the proximal humerus, specifically when this is performed with the use of an allograft. A bone cyst is defined as a fluid-filled space within the bone, which can vary in type. The unicameral or simple bone cyst is a common benign lesion, while the aneurysmal bone cyst is less common and characterized by vascular tissue surrounding a blood-filled cystic lesion. Additionally, there are various types of benign bone tumors, including giant cell tumors, chondromyxoid fibromas, and enchondromas. The procedure involves making an incision over the lesion site in the proximal humerus, followed by dissection of the soft tissues to expose the lesion. If a cystic lesion is identified, the bone is incised to create a window, allowing for the aspiration of fluid, which is then sent for laboratory analysis. The lining of the cystic cavity is removed using a curette. In cases where benign tumors are present, the lesion is excised along with a margin of healthy bone. Following the excision or curettage, the defect created in the proximal humerus is filled with donor bone (allograft), which is essential for the healing process and structural integrity of the bone.

© Copyright 2025 Coding Ahead. All rights reserved.

1. Indications

The procedure described by CPT® Code 23156 is indicated for the treatment of specific conditions related to bone cysts or benign tumors in the proximal humerus. The following are the explicitly provided indications for this procedure:

  • Bone Cysts - Fluid-filled spaces within the bone that may require excision or curettage.
  • Benign Tumors - Non-cancerous growths in the proximal humerus that necessitate removal to prevent complications or further growth.

2. Procedure

The procedure for CPT® Code 23156 involves several critical steps that ensure the effective removal of the bone cyst or benign tumor while preparing the site for grafting. The following procedural steps are outlined:

  • Step 1: Incision and Exposure - An incision is made in the skin over the site of the lesion located in the proximal humerus. The surgeon carefully dissects the soft tissues to expose the lesion, ensuring minimal damage to surrounding structures.
  • Step 2: Creation of Bone Window - If a cystic lesion is present, the surgeon incises the bone to create a window, allowing access to the cyst. This step is crucial for the subsequent aspiration of fluid from the cystic cavity.
  • Step 3: Aspiration and Curettage - The fluid within the cyst is aspirated and sent to the laboratory for analysis. A curette is then inserted through the bone window to completely remove the lining of the cystic cavity, ensuring that all pathological tissue is excised.
  • Step 4: Excision of Benign Tumor - In cases where a benign tumor is present, the lesion is excised along with a margin of surrounding healthy bone to ensure complete removal and reduce the risk of recurrence.
  • Step 5: Packing the Defect - After the lesion has been removed, the resulting defect in the proximal humerus is packed with donor bone (allograft). This step is essential for promoting healing and restoring the structural integrity of the bone.

3. Post-Procedure

Post-procedure care following the excision or curettage of a bone cyst or benign tumor with allograft involves monitoring the surgical site for signs of infection and ensuring proper healing. Patients may be advised to limit movement of the affected arm to facilitate recovery. Follow-up appointments are typically scheduled to assess the healing process and to ensure that the allograft is integrating properly with the surrounding bone. Additional imaging studies may be required to evaluate the success of the procedure and the stability of the graft.

Short Descr REMOVAL OF HUMERUS LESION
Medium Descr EXC/CURTG BONE CYST/BENIGN TUM PROX HUM W/ALGRFT
Long Descr Excision or curettage of bone cyst or benign tumor of proximal humerus; with allograft
Status Code Active Code
Global Days 090 - Major Surgery
PC/TC Indicator (26, TC) 0 - Physician Service Code
Multiple Procedures (51) 2 - Standard payment adjustment rules for multiple procedures apply.
Bilateral Surgery (50) 1 - 150% payment adjustment for bilateral procedures applies.
Physician Supervisions 09 - Concept does not apply.
Assistant Surgeon (80, 82) 2 - Payment restriction for assistants at surgery does not apply to this procedure...
Co-Surgeons (62) 0 - Co-surgeons not permitted for this procedure.
Team Surgery (66) 0 - Team surgeons not permitted for this procedure.
Diagnostic Imaging Family 99 - Concept Does Not Apply
APC Status Indicator Hospital Part B services paid through a comprehensive APC
ASC Payment Indicator Surgical procedure on ASC list in CY 2007; payment based on OPPS relative payment weight.
Type of Service (TOS) 2 - Surgery
Berenson-Eggers TOS (BETOS) P3D - Major procedure, orthopedic - other
MUE 1
CCS Clinical Classification 142 - Partial excision bone
51 Multiple procedures: when multiple procedures, other than e/m services, physical medicine and rehabilitation services or provision of supplies (eg, vaccines), are performed at the same session by the same individual, the primary procedure or service may be reported as listed. the additional procedure(s) or service(s) may be identified by appending modifier 51 to the additional procedure or service code(s). note: this modifier should not be appended to designated "add-on" codes (see appendix d).
59 Distinct procedural service: under certain circumstances, it may be necessary to indicate that a procedure or service was distinct or independent from other non-e/m services performed on the same day. modifier 59 is used to identify procedures/services, other than e/m services, that are not normally reported together, but are appropriate under the circumstances. documentation must support a different session, different procedure or surgery, different site or organ system, separate incision/excision, separate lesion, or separate injury (or area of injury in extensive injuries) not ordinarily encountered or performed on the same day by the same individual. however, when another already established modifier is appropriate it should be used rather than modifier 59. only if no more descriptive modifier is available, and the use of modifier 59 best explains the circumstances, should modifier 59 be used. note: modifier 59 should not be appended to an e/m service. to report a separate and distinct e/m service with a non-e/m service performed on the same date, see modifier 25.
AS Physician assistant, nurse practitioner, or clinical nurse specialist services for assistant at surgery
GC This service has been performed in part by a resident under the direction of a teaching physician
LT Left side (used to identify procedures performed on the left side of the body)
RT Right side (used to identify procedures performed on the right side of the body)
SG Ambulatory surgical center (asc) facility service
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